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R. J. SHEE'HY PRINTING TELEGRAPH.

N0.'506,273. Patented Oct. 10, 1893.

4 Sheets-Sheet 2.

m H M E G B m d 0 M 0 m Patented Oct. 10

I No. 506,273.

H ilsriszl W W a M {No Model.) 4 sheets sheet 4.

R. J. SHEEHY. PRINTING TELEGRAPH.

No. 506,273. Pate ted 001;. 10, 1893.

04k as Q 307 W W' f M- UNITED STATES PATENT OFFICE.

ROBERT J. SHEE HY, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGN- MENTS,TO WENDELL GOODWIN, OF SAME PLACE.

PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 506,273, dated October10, 1893.

Application filed October 31, 1890. Renewed March 15, 1893- Serial No.466,173- (No model.)

To all whom it may concern.-

Be it known that I, ROBERT J. SHEEHY, a citizen of the United States,residing at New York, in the county and State of New York, have inventedcertain new and useful Improvements in Printing-Telegraphs, (Case A,) ofwhich the following is a specification.

My invention relates to that class of printing telegraphs in which theinstruments .are driven synchronously by currents transmitted over asynchronizing or controlling line, and messages are transmitted over anoperating or message line. Such a system may be a printing telegraphexchange system and for such a system my invention is specially adapted.In the instrument herein described I provide an organization by whichthe resistance of the synchronizing line is maintained practicallyconstant and at the same time provides a means for calling up thecentral oflice. To this end I employ an induction coil through theprimary of which the synchronizing line extends when the instrument isnot in use. The secondary of this coil is normally closed upon itselfand may include a suitable resistance. The primary is designed to be ofthe same resistance as the motor coil through which the controlling orsynchronizing line extends when the instrument is in operation. Thesecondary circuit is connected to earth at one point and by themanipulation of a key the secondary current may be sent over thetelegraphing line to call the central office. The instruments are drivenby an armature lever having a pallet or anchor engaging a star wheel onthe type wheel shaft, the armature being vibrated by alternatingcurrents passing in the motor or actuating coil. The organization isfurther such that upon the reception of a printing or message impulse ofcurrent a switch is released to automatically transfer the synchronizingor controlling circuit from the primary of the inductorium through themotor or type Wheel actuating coil, and the instrumentimmediatelycommences to rotate.

My invention is comprised in the general organization above outlined, aswell as the details of construction and special organization hereinafterset forth.

In the accompanying drawings; Figure l is 'a diagram view illustratingthegeneral arrangement and operation of the system; Fig. 2 a front viewof the instrument; Fig. 3 a plan view; Fig. 4 a transverse section onthe line 4, 4,0f Fig. 3; Fig. 5 a detail sectional view of the motordevices.

The general organization will be described first, more especially withreference to the diagram Fig. 1.

' The synchronizing line L runs to the arm of a pivoted switch Shearing, when the instrument is not in operation, upon an insulatedcontact 8, connected with the primary P1, of an induction coil, theother terminal of which is connected to the outgoingline L. The pivotedswitch has two other. insulated arms S, S the formerof which is engagedby a spring catch 19, on the press lever P. The switch is thereforenormally held in the position shown against the tension of its spring 8'which tends to transfer it to the contact 8 With the switch in theposition shown the arm S operates to throw the switch T over upon itscontact t which is connected with the earth at E. The telegraphing lineL is connected with this switch and is, therefore, normally grounded. Itextends from the switch through the coil of a relay. R to the upper stopof a key K to which the main line L is connected.' The secondary Sy ofthe inductorium may include a suit able resistance Rh. Its metalliccircuit is grounded at E, and is normally closed through the bottom stopk of key K, the stop connected therewith, and spring contact 70noroperate a call hell 0 B that may be placed in coils of the relay R toearth at E vitalizes that relay and effects the following operation: Itsarmature B. being attracted,'the armature lever closes the local circuitof the press magnet P at the contacts w w. The press magnet attracts itsarmature and the press lever P is thrown up, releasing the arm S of theswitch S which is immediately thrown by its spring over to the contact 8The synchronizing circuit is therefore transferred from the primary ofthe inductoriuin through the coil M of the motor magnet, the contact 5''being connected by a wire 1 with one terminal of the coil M. The sameterminal of the coil is connected by wire 2 with an insulated contactfinger y, and the opposite terminal is connected by wire 3 with acontact finger 3 mounted upon and insulated from the armature lever B,and vibrating between the contact finger y and a similar insulatedcontact finger y. The finger g is connected by wire 4 with one terminalof the coil of a magnetN whose armature N is mounted upon a rightangular extension of the armature lever R. The opposite terminal of thecoil N is connected by wire 5 with the contact finger y and also by wire6 with the outgoing syn chronizing line L. Alternating; impulsestraversing the coil M produce the step by step rotation of the typewheel shaft B in a manner hereinafterdescribed. When the switch S is onthe contact .9 and the magnet R is vitalized by a message current, thepress magnet lever effects an impression from the type wheel. At thesame time the contact arm is transferred from the contact to the contacty. The motor coil Mis therefore shunted through the conductor 2 contacts31,11 and the circuit is through wire 4 and coils of magnet N to line byWires 5 and 6. The magnet N, attracts its armature, supplementing theaction of the magnet R, and the condition described is maintained aslong as either the printing impulse or the impulse in the synchronizingline lasts. If, at the moment the printing 1mpulse ceased to beeffective in the coils of the magnet R, an impulse of either polarityfrom the synchronizing line was traversing the coils of magnet N, thatimpulse would cause magnet N to still attract its armature and maintainthe condition already described, d. a, the motor coil would be stillshunted. But on the cessation of said impulse in the coils of magnet N,there then being no current in the coils of magnet R, the armatures of Nand R would fall back, the print circuit would be opened, and the shuntaround the motor coil broken, and the current from the synchronizingline again traversing the motor coil, its armature would be vibrated anddrive the type-wheel shaft. Vere it not for this arrangement thetransmitting and receiving instrumentsmight not start exactly together.If the throwing of the motor coil into circuit depended entirely uponthe magnet B, it might occur at a time when only a fraction of theimpulse at the time traversing the synchronizing line would pass throughthe motor coil and a false movement of its vibrating armature mightoccur at one of the instruments; whereas with the arrangement describedthe motors always start when a complete impulse from the synchronizingline traverses their coils. Then the armature lever R falls back uponthe demagnetizing of the magnets N and R the circuit through the motormagnet M is restored, it being as follows: From the contact 8 throughthe coil of the magnet and by contacts 3 and y, which are normally incontact, and thence by wire 6 to the line, the magnet N now beingshunted. The source of current for transmission of messages may belocated at the central office. When the operator desires to transmit,the switch T is put over to the contact '6. The transmitting circuit isthen from earth at E, through the trailer of the sunflower, on the typewheel shaft B, the respective segments thereof, keys and key contacts,to the switch point i, switch T and thence through the magnet R, and keyK to line L. Both the sending and receiving instruments are thereforeoperated, as is well understood, to print the desired charactersselected by the depression of the transmitting keys. It is contemplatedthat the resist ance of the primary of the induction coil shall equal,or approximately equal that of the coil M, and that the coil N shallequal or approximately equal that of the coil M. A condition ofpractically uniform resistance is, therefore maintained in thesynchronizing line. The use of a secondary current for calling isdesirable because the transmitting batter at the central station neednot be always nected with the operating line, and no calling batteryneed be located at each instrument. At the same time the current on thesynchronizing line must at all times be sufficient for the motor,andwhen the instrument is not in use may without loss be directed throughthe primary of the inductorium.

The general organization and operation being understood, theconstruction of different parts of the instrument .will be described.Such parts as are not particularly described may be assumed to be ofordinary and well known construction.

The coil M is mounted upon .a brass bobbin M having a projection at eachend by which it is secured to the front and back plates of theinstrument. Within the coil is loosely arranged a soft iron core Mpivoted in bearing M in the front and back plates. On each end of thecore is fixed an iron arm M projecting upwardly between the oppositepoles of permanent magnets M that may be curved as shown in Fig. 4.- andprovided with pole pieces on. The arms M are alternately polarized bythe reverse currents traversing the coil M, and are consequently drivenback and forth between the pole pieces m of the permanent magnets. Oneof the arms M carries an extension M having atits end an anchor orpallet that engages the teeth of and drives a star Wheel B fast on thetype wheel shaft B, a stop 13 engaging a ratchet Wheel on the sameshaft, serving to prevent back motion. The general arrangement of usual.

the machine is seenin Fig. 3. The sunflower being mounted in asuitablecasing at the back of the instruments and the keyboard at the front. Theparts corresponding with those described in the diagram are similarlylettered and more specific description is unnecessary. The armature ofthe press mag-- projecting stud on the platen arm' and is tripped at theproper moment by a trippingpost Q acting upon an angular extension'ofthe pawl Q. a

Any suitable unison device may be employed in this instrument, thatshown at U, 7 Figs; 3 and 2 is the same as shown in sundry LettersPatent already granted to me. An arm a, mount'ed'on an eccentric on thetype wheel shaft gradually-advances alcurved toothed sector plate a stepby step until a stop a thereon intercepts a pin a onthe type-wheelshaft. An arm U carried by the rock'shaft P throws up the arm a when animpression is taken from the type wheel and the sector plate falls backby gravity or the action of a spring' A detent a that prevents thefalling back of the sector plate is also thrown up by the arm-U.

I claim as my invention- '1. The combination of thesynchronizing line,the independent message line, the type wheel operating devices, themotornormally out of the synchronizing line, a magnet in the message lineenergized by impulses received over said line, and automatic switchdevices actuated upon the energizing of said magnet to transfer thesynchronizing circuit'through the motor.

2. The combination of the synchronizing line, a resistance through whichthe line is normally completed at each'instr ument, the motor coil ofapproximately equal resistance, the telegraphing line and switch devicesfor transferring the synchronizing circuit through the motor coil,and'cuttiug out the resistance.

3. The combination of the synchronizing line, the switch S and primaryofan induction coil through which the synchronizing line normally passes,the telegraphing line, a magnet or relay R therein, the press magnet,whose local circuit is completed upon the energizing of the magnet R,the motor coil for actuating the type-wheel shaft, and a detent on thepress lever from which said switch 4. The combination of thetelegraphing 1ine,'a magnet R and a switch T included therein, thesynchronizing line, a switch S,

having the arms S, S included therein, the press lever, and the catchthereon engaging the arm S substantially'as and for the purpose setforth.

5. The combination of the synchronizing vline, a switch (S) and primaryof the inductorium included therein the secondary circuit of theinductorium, the telegraphing line, and means for including thesecondary circuit in said line.

6. The'combination of the synchronizing line, the primary of aninductorium normally included therein, the secondary coil of theinductorium whose circuit is normally closed upon itself and connectedto earth on one iside of the coil, the telegraphing line, and

means for connecting the secondary on the other side of said coil, forthe purpose set forth.

7. In a printing telegraph, the combination,

of a'type-wheel and its shaft, type wheel shaft actuating devices,asynchronizing line over which impulses of current are received to0perate said devices, a telegraphing line, an

electro magnet therein, means for throwing the type wheel' actuatingdevices out of ac.-

tion when said magnet is vitalized, a second magnet also operating tothrow the typewheel shaft actuating devices out of action,

and circuit connections and contact devices,

by which when the first of said magnets is vitalized the second isincluded in the synimpulses of current are received to actuate too saiddevices, a telegraphing line, a magnet (R) included therein, itsarmature lever,a

second magneHN) acting upon said armaized thetype'wheel actuatingdevices are eliminated from the second magnet included in thesynchronizing line.

9. The combination, in a printing telegraph, of a type wheel, a motorcoil, a synchronizing line passing through said coil over which impulsesof current for actuating the type wheel are sent, a telegraphing line,an electro mag net coil included therein, a second electro magnetcoil ofsubstantially the same resistance as the motor coil,'and contacts andcircuit connections controlled by both of said coils, whereby whentheformer is ,vitalized the motor coil is eliminated from the synchronizingline and the latter included therein.

In testimony whereof I have hereunto'subv

